There's a recent overview of that kind of thing here: Scan Methods and Their Application in Image Compression Tarek Ouni and Mohamed Abid http://www.sersc.or

There's a recent overview of that kind of thing here: Scan Methods and Their Application in Image Compression Tarek Ouni and Mohamed Abid http://www.sersc.org/journals/IJSIP/vol5_no3/4.pdf http://www.sersc.org/journals/IJSIP/vol5_no3/4.pdf